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/etc/systemd/system/peelock.service

[Unit]
Description=Lock X session using slock

[Service]
User=john
Environment=DISPLAY=:0
ExecStart=/usr/bin/slock

[Install]
WantedBy=sleep.target 

/usr/share/X11/xorg.conf.d/20-intel.conf

# to make the display work again after sleep.
# first find out the bus ID for vga
# lspci | grep VGA
Section "Device"
        Identifier      "Intel Graphics"
        Driver          "intel"
        Option          "Backlight" "intel_backlight"
        BusID           "PCI:0:2:0"
EndSection